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Enhanced Carrier–Exciton Interactions in Monolayer MoS2 under Applied Voltages
journal contribution
posted on 2020-03-24, 16:03 authored by Yuanzheng Li, Weizhen Liu, Hang Ren, Qiushi Feng, Jiaxu Yan, Weiheng Zhong, Xing Xin, Haiyang Xu, Yichun LiuCarrier–exciton
interactions in two-dimensional transition metal dichalcogenides (TMDs)
is one of the crucial elements for limiting the performance of their
optoelectronic devices. Here, we have experimentally studied the carrier–exciton
interactions in a monolayer MoS2-based two-terminal device.
Such two-terminal device without a gate electrode is generally considered
as invalid to modulate the carrier concentration in active materials,
while the photoluminescence peak exhibits a red shift and decay with
increasing applied voltages. Time-resolved photoluminescence spectroscopy
and photoluminescence multipeak fittings verify that such changes
of photoluminescence peaks result from enhanced carrier–exciton
interactions with increasing electron concentration induce the charged
exciton increasing. To characterize the level of the carrier–exciton
interactions, a quantitative relationship between the Raman shift
of out-of-plane mode and changes in electron concentration has been
established using the mass action model. This work provides an appropriate
supplement for understanding the carrier–exciton interactions
in TMD-based two-terminal optoelectronic devices.
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Monolayer MoS 2photoluminescence peak exhibitsTime-resolved photoluminescence spectroscopymass action modelmonolayer MoS 2transition metal dichalcogenideselectron concentrationphotoluminescence multipeak fittingsCarrierTMD-based two-terminal optoelectronic devicesinteractionshiftSuch two-terminal devicecarrierphotoluminescence peaks result
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